Method applyBookChange

js/ReadingSystem.js:139–159

* 应用课本切换 * @param {string} bookKey - 目标课本 key * @returns {Promise }

(bookKey)

   * @returns {Promise<void>}
   */
  async applyBookChange(bookKey) {
    await this.loadBooks();

    const resolved = this.resolveBookByKey(bookKey);
    if (!resolved?.bookPath) {
      this.state.bookPath = '';
      this.state.bookKey = '';
      this.renderEmptyState(this.config.ERROR_MESSAGES.NO_DATA);
      return;
    }

    this.state.bookKey = resolved.key || bookKey;
    this.state.bookPath = resolved.bookPath.trim();
    setStorage(this.config.STORAGE_KEYS.BOOK_SELECTION, this.state.bookKey);

    this.updateBookSelects();
    await this.loadBookConfig();
    this.renderUnitList();
    this.renderUnitSelect();
    this.resetUnitListScroll();
  }

  /**
   * 加载课本配置（book.json）